Rear wheel speedo sencers

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New Member
Mar 30, 2017
C180 Elegance 1995
On the rear wheel, I believe there are speedo sensors.
This is on my 1995 C180.
Am I correct to clean them I take off the rear wheels, then unbolt 2 of the bolts that hold it.
Then put a wire brush over them.
The problem is my speedo will not work until I go 1/2 a mile then it comes on but after 5 miles it go's off, it drives me nuts on and off all the time but after say 10 miles it stays on.
Aren't those for the ABS? - The speedometer takes its reading from the gearbox, doesn't it?

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